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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 2
 1
 4
 8

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary open circuited.
 auto transformer.
None of these
 two winding transformer with secondary short circuited.

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Electrical Machines
Transformer core is laminated to reduce

 both 1 and 2.
 hysteresis loss.
 eddy current loss.
 copper loss.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 Ia
 1/Ia
 I/Ia2
 Ia2

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

 to carry extra load.
None of these
 to interconnect three voltage systems.
  to suppress harmonic and unbalance in voltage.

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Electrical Machines
A single-winding single-phase motor has

 starting torque equal to full-load torque.
  zero starting torque.
 low starting torque.
 high starting torque.

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